Coix lacryma-jobi Seeds | Job’s Tears Tear Grass Adlay Adlai
LATIN NAME: Coix lacryma-jobi
COMMON NAME: Job’s Tears
Plant Profile
The bead is not a seed coat but an involucre — a hardened, glossy shell that encloses the female flower and later the grain. Each shell carries a natural pore at its tip where the style emerged, and that pore is the ready-made threading hole. Shells vary from dark grey and near-black through brown to pearl white and even banded forms, and craft workers sort them by colour into separate lots. No temperamental grass in the garden produces anything else quite like it.
The wild plant makes small, extremely hard beads and sheds them freely — the lacryma-jobi form. Selective cultivation across Asia produced var. ma-yuen, a taller plant with larger, softer-shelled grain that threshes out like a cereal, eaten as adlay or adlai in the Philippines and as yi yi ren in Chinese kitchens and pharmacies. The domesticated form barely resembles its wild parent in the hand, which is a neat lesson in how quickly grain crops diverge under selection.
Science & Biotechnology
The grain has a research file to match its history. Chemists working on coix seed have described coixol, a benzoxazinone-type compound, and coixenolide, an unusual hydroxylated fatty acid ester found in the seed oil, along with a family of water-soluble polysaccharides often called coixans. These mark the seed out among cereals, and they anchor the modern pharmacological interest in the grain, which follows its long use in classical formulas for dampness and digestion.
Laboratory groups have taken particular interest in the seed’s polysaccharide fractions and in seed-oil emulsions, work that treats coix less as folklore and more as a renewable feedstock of unusual molecules. Studies of the oil fraction and of the protein complement run alongside the polysaccharide chemistry, and the cultivated grain varieties differ measurably in oil content — a fact breeders use when selecting lines for food use rather than bead use.
Uses & Benefits
Wild populations cluster around the mountains of northeastern India, Yunnan and Indochina, and that geography matches the grain’s oldest records. Beads travelled faster than botany: they appear in East Asian rosaries and ritual strings centuries before any European described the plant, and Japanese temple beads of Job’s tears — juzudama — are still sold today alongside polished plastic imitations.
Scenario by scenario, the plant splits cleanly. For craft: gather the shells as they harden, dry them thoroughly, and string them as-is — the wild forms give the hardest, most durable beads, and a needle and strong thread suffice. For the table: thresh the domesticated grain, polish it lightly to remove the shell, and cook it like pearled barley — simmered into soups, porridges and the sweet Chinese barley water that fills summer bottles. The flavour is mild and nutty, and the grain holds its bite in long cooking better than rice does.
In the Philippine highlands, adlai has been revived as a climate-resilient staple, marketed as a whole grain for bowls and salads, and chefs value it for the same pearl-like texture that made the porridges of southern China famous. Roasted grain also yields a coffee-like drink, an old kitchen trick shared with barley and chicory.
Growing from Seed
Treat the seed like maize, its closest garden relative. Sow after all risk of cold has passed, directly where the plants will stand, in a warm, deeply worked soil enriched with compost. Set seeds three to four centimetres deep and thirty centimetres apart in rows half a metre wide, or sow in deep modules under cover and set them out when roots fill the cell. The broad, strap-shaped, corn-like leaves make thinning easy: remove the weaker of any pair early, and the stand closes into a dense clump that shades its own weeds.
Seedlings come up with the strong, single first leaf of the grasses and move quickly once warmth settles. Keep the bed moist through establishment; the plant tolerates short dry spells once rooted but stands taller and beads heavier with a steady water supply. In long-season climates the crop finishes on its own schedule, and in short-season ones starting under cover buys the extra warmth the beads need to harden.
Feed with a balanced dressing when the stems begin to joint, the same signal maize gives. Harvest beads when the shells have hardened and rattled — pull the whole head, dry it in an airy shade, then rub the tears free. For grain, wait until the heads brown fully, then thresh and de-hull. One bed supplies both uses if you sort the harvest: the hardest shells to the craft box, the plumpest grain to the kitchen.
Our Take
Job’s tears is the rare crop that serves the bead box and the soup pot from the same square metre. For the cultivated grain line, see Chinese Job’s tears, var. ma-yuen, and for the grain’s place in the pharmacy, read the notes on Job’s tears for digestion and lung function.
Related Reading
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